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US 5,194,550 AGranted
Acrylate-based adhesive polymer
AssigneeThe Dow Chemical Company
InventorsRobert W. Rance, Etienne R. D. A. Lazarus
Life of this patent
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Abstract
A (meth)acrylate-based adhesive polymer composition is improved by the use of itaconic acid and a hydroxyalkyl (meth)acrylate, such as hydroxyethyl acrylate, polymerized therein. From 1 to 5 weight percent itaconic acid and from 1.5 to 17 weight percent hydroxyalkyl (meth)acrylate are used to improve the combinations of tack and shear strength in these adhesive polymers. With an optional tackifier, these polymers are found especially useful in pressure sensitive adhesive applications.
Claims18
A pressure sensitive adhesive polymer consisting of
- A. at least one (meth)acrylate monomer represented by the formula
- (CH.sub.2 .dbd.C(R.sub.1)--C(O)--O--R.sub.2 ;
- B. optionally from 1 to 80 weight percent of a conjugated diene represented by the formula
- CH.sub.2 .dbd.C(R.sub.3)--C(R.sub.4).dbd.C(R.sub.5)--R.sub.6 ;
- C. optionally from 1 to 50 weight percent of a monovinylidene aromatic monomer according to the formula
- Ar--C--(R.sub.7).dbd.CH.sub.2
- D. from 1.5 to 17 weight percent of a hydroxyalkyl (meth)acrylate is represented by the formula
- CH.sub.2 .dbd.C(R.sub.8)--C(O)--O--R.sub.9 --OH;
- and
- E. from 1 to 5 percent by weight of itaconic acid;
- R.sub.1 is --H or a methyl radical;
- R.sub.2 is a straight or branched chain alkyl radical having from 2 to 8 carbon atoms;
- R.sub.3, R.sub.4, R.sub.5 and R.sub.6 are independently --H, halogen, or 1- or 20- carbon hydrocarbon radicals;
- R.sub.7 is --H or a 1- to 4-carbon hydrocarbon alkyl group;
- R.sub.8 is --H or methyl radical;
- and
- R.sub.9 is a straight or branched chain hydrocarbon radical having 1 to 10 carbon atoms.
14 more elements
A pressure sensitive adhesive composition comprising
- I. from 30 to 95 percent by weight of a pressure sensitive adhesive polymer consisting of
- A. at least one (meth)acrylate monomer represented by the formula
- CH.sub.2 .dbd.C(R.sub.1)--C(O)--O--R.sub.2 ;
- B. optionally from 1 to 80 weight percent of a conjugated diene represented by the formula
- CH.sub.2 .dbd.C(R.sub.3)--C(R.sub.4).dbd.C(R.sub.5)--R.sub.6 ;
- C. optionally from 1 to 50 weight percent of a monovinylidene aromatic monomer according to the formula
- Ar--C--(R.sub.7).dbd.CH.sub.2
- D. from 1.5 to 17 weight percent of a hydroxyalkyl (meth)acrylate is represented by the formula
- CH.sub.2 .dbd.C(R.sub.8)--C(O)--O--R.sub.9 --OH;
- and,
- E. from 1 to 5 percent by weight of itaconic acid;
- and,
- II. from 5 to 70 weight of a tackifier;
- wherein
- R.sub.1 is --H or a methyl radical;
- R.sub.2 is a straight or branched chain alkyl radical having from 1 to 20 carbon atoms;
- R.sub.3, R.sub.4, R.sub.5 and R.sub.6 are independently --H, halogen, or 1- or 20- carbon hydrocarbon radicals;
- R.sub.7 is --H or a 1- to 4-hydrocarbon alkyl group;
- R.sub.8 is --H or methyl radical;
- and
- R.sub.9 is a straight or branched chain hydrocarbon radical having 1 to 10 carbon atoms.
18 more elements
Dependencies are inferred from the claim text.